Relate asymmetric positioning of auxin export proteins to directional transport and hormone concentration gradients.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2024–2026.
Two upright oat coleoptiles receive light from the left. A thin impermeable insert is placed just below the tip on opposite sides of P and Q. The diagram records their appearance before and after exposure. (i) Identify the directional response of Q. (ii)…
Chemical messages coordinate cells and whole organisms. (a) Describe bacterial quorum sensing. (b) Outline roles of calcium ions in animal-cell signalling. (c) Explain how plant hormones regulate growth through signalling.
Which feature of auxin transport contributes to directional growth of a shoot? A. Efflux carriers are distributed asymmetrically in cell membranes B. Efflux carriers transport auxin only into cells C. Auxin pumps hydrogen ions exclusively into the nucleus D.…
The shoot changes shape under one-sided illumination. Which set of processes can explain the response? I. Polar positioning of auxin-export proteins redistributes auxin. II. Auxin stimulates proton secretion into the wall. III. Wall acidification permits…
(i) Annotate the diagram with an arrow showing net auxin transport through the cell. (ii) Identify an environmental stimulus that can alter carrier distribution.
Which explanation is consistent with the treatment’s effect on shoot growth? A. The barrier prevents auxin moving from the tip to elongating cells below B. The barrier increases auxin movement and therefore stops elongation C. Growth is prevented because light…
(a) Describe how auxin produces a shoot’s directional growth response to light. (b) Outline feedback interactions among hormones controlling ovarian and uterine cycles. (c) Explain how the loop of Henle and ADH influence urine concentration.
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